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Two Year Limited Warranty

Climate Controls Americas 

warrants to the original contractor

installer, or to the original consumer user, each new Robertshaw thermo-
stat to be free from defects in materials and workmanship under normal
use and service for a period of two (2) years from date of purchase. This
warranty and our liability does not apply to batteries or merchandise that
has been damaged by misuse, neglect, mishandling, alterations, improper
installation, or use in a way other than in accordance with 

Climate

Controls Americas 

recommendations and instructions.

Climate Controls Americas 

agrees to repair or replace at its option

any thermostat under warranty provided it is returned within the warranty
period, postage prepaid, with proof of the date of purchase. Cost of 
thermostat removal or reinstallation is not the responsibility of 

Climate

Controls Americas

.

Repair or replacement as provided under this warranty is the exclusive
remedy of the consumer. 

Climate Controls Americas 

shall not be liable

for any incidental or consequential damages for breach of any express or
implied warranty on this product, or under any other theory of liability.
Except to the extent prohibited by applicable law, any implied warranty of 
merchantability or fitness for a particular purpose on this product is 
limited to the duration of this warranty.

Some states do not allow the exclusion or limitation of incidental or 
consequential damages, or allow limitations on how long an implied war-
ranty lasts, so the above limitations or exclusions may not apply to you.
This warranty gives you specific legal rights, and you may also have other
rights which vary from state to state.

For warranty returns, send thermostat, shipping prepaid to:

Invensys Climate Controls Americas

Warranty Claims Department

515 S. Promenade
Corona, CA 91719

©2003 Climate Controls Americas

110 -1044B

11

Climate Controls Americas
191 E. North Avenue
Carol Stream Illinois  60188
United States of America

TM

Summary of Contents for 9420

Page 1: ...djustable 1st stage temperature differential 0 5 F to 3 0 F 0 5 C to 1 5 C Adjustable 2nd stage temperature differential 1 F to 6 F 0 5 C to 3 0 C Adjustable 2nd stage delay 10 40 min Compressor short cycle protection Accuracy within 1 Zone system compatible as a master thermostat Permanent memory retention Fahrenheit Celsius display option Adjustable from 45 F to 90 F 7 C 32 C Quick wire terminal...

Page 2: ...placing Existing Thermostat 1 Turn off power to heating and cooling system 2 Remove cover from old thermostat to expose wires Figure 1 3 Disconnect wires one at a time from existing terminals Use enclosed labels to mark existing wires Refer to cross references in Table 1 if existing wiring does not directly match the labels 4 Remove existing thermostat base from wall Old Terminal New Label Descrip...

Page 3: ...completing the change the display will return to the current room temperature after a few seconds CHANGING THE TEMPERATURE DIFFERENTIAL DEAD BAND AND RESIDUAL COOL The temperature differentials are factory set at 1 F and 2 F for 1ST and 2ND stages respectively The dead band for Auto changeover is set at 3 F To change settings 1 Press the and buttons at the same time and hold for 1 second Display w...

Page 4: ...a 3 16 drill bit 9 Align base with plastic anchors and feed wires through opening 10 Secure base to wall with supplied screws NOTE THE THERMOSTAT WILL MOUNT HORIZONTALLY ON A SINGLE GANG JUNCTION BOX 11 Strip end of wires 5 16 if needed 12 Terminal screws are already loose and ready for wire insertion Insert wires into terminal strip Figure 5 matching the label to the corresponding terminal see Wi...

Page 5: ...iary emergency heat Does not have separate wire for emergency heat jump W2 E Typical heat pump with cool active reversing valve auxiliary emergency heat and second stage of cooling System fault indicator connected L terminal O B 9420 WIRING SAMPLE 1 Y1 E G W2 C L R Y2 9420 WIRING SAMPLE 2 C L R Y2 Y1 E G W2 O B 9420 WIRING SAMPLE 3 B Y1 E G W2 C L O E G R Y2 Jumper O B 9420 WIRING SAMPLE 4 C W2 L ...

Page 6: ...nection Yes For input of 24VAC common side of transformer L System fault indicator connection No For connection of system fault indicator if present R 24VAC hot connection Yes For input of 24VAC hot side of transformer Y2 Second stage cooling connection No Energizes on a call for second stage cooling Y1 First stage compressor connection Yes Energizes on a call for first stage of heating and coolin...

Page 7: ... read HEAT 5 Press the button until the temperature setting is at least 3 degrees above room temperature The heating system should turn on The fan may not turn on immediately depending on the fan delay built into the furnace The flame icon will be displayed 1st stage heating 2nd stage heating 6 Put the EMER HEAT OFF COOL switch into the OFF position The heating system should turn off The fan may c...

Page 8: ...t temperature for heating is 70 F 21 C To change the default setpoint put the system switch in HEAT and press the or button to adjust the temperature setting up or down The display will show SET The display will return to the current room temperature three seconds after the last input and the new setpoint will be saved Cooling The default temperature for cooling is 78 F 25 C To change the default ...

Page 9: ...emperature in degrees Fahrenheit US models or degrees Celsius Canadian models The temperature display can be changed Press and hold both the and button for three seconds The display will read F or C Release buttons Press the or button to switch the display 2 After three seconds the display will switch to the 1st stage differential settings The display will read DIFFERENTIAL 1st The temperature dif...

Page 10: ...ider Check F C Fahrenheit Celsius setting See Changing Fahrenheit F to Celsius C Thermostat does not display proper room temperature Thermostat turns system on and off too frequently Thermostat does not turn on system Check wiring see Installation section Increase temperature differential see Changing the Temperature Differential section If problems with thermostat cannot be resolved call Technica...

Page 11: ...acement as provided under this warranty is the exclusive remedy of the consumer Climate Controls Americas shall not be liable for any incidental or consequential damages for breach of any express or implied warranty on this product or under any other theory of liability Except to the extent prohibited by applicable law any implied warranty of merchantability or fitness for a particular purpose on ...

Page 12: ...NOTES 12 ...

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